seed keyword help

[out of bounds]

Would appreciate any help you could provide with this issue.

i am basically trying to develop a simple application to take a user's
input of seed keyword from a php form and then passing that seed
keyword into the example get keyword variations php file that makes
the call to the google api.

however, whenever i try to pass the form variable for the seed keyword
directly from the POST into the actual xml, i get an error message. i
have researched xml and php on google and cant seem to come up with
anything useful. the error message isnt particularly helpful or
specific. it is "Warning: Invalid argument supplied for foreach() in /
home/outofbo1/public_html/GAW/My_write_keyword_variations.php on line
76".

the xml code that i am using is based on code examples provided by
google. i am using the code below as part of the php 'action' file for
processing a simple form that asks the user what keyword they want to
analyze. then i pass that value into the code as shown in example two
below.

example one below shows the (partial) code that works when i simply
'hard code' the keyword to test the functionality ('keyword manually
entered here')

example one:

$request_xml =
'<checkKeywordTraffic>' .
'<requests>' . keyword manually entered here. '</requests>' .
'</checkKeywordTraffic>';
$estimates = $estimator_service->call('checkKeywordTraffic',
$request_xml);

example two (code that doesnt work);

$MyKeyword = $_POST["MyKeyword"]
$request_xml =
'<checkKeywordTraffic>' .
'<requests>' . $MyKeyword . '</requests>' .
'</checkKeywordTraffic>';
$estimates = $estimator_service->call('checkKeywordTraffic',
$request_xml);

i am thinking the issue is that you cant simple pass a variable's
value into an xml statement but that i will have to take the form
input, generate the entire $request_xml statement and then include
that as a separate file.

any ideas or did i confuse you with my horrible explanations as
usual? :)

thanks in advance,

jay wilner